On this presentation i describe all the features and types of diode. This presentation started from short but understandable history of diode or zener . How diode is working? Answer of this question also clear after read all this presentation.
The three types of rectifiers in just 18 slides. Learn and enjoy the concepts. This PowerPoint presentation not only tells about the working and principles of rectifiers but also determines the disadvantages and advantages of different rectifiers. This PowerPoint presentation also has circuit diagrams that suit your necessities. This PPT can be written as an answer for a long type of question too.
On this presentation i describe all the features and types of diode. This presentation started from short but understandable history of diode or zener . How diode is working? Answer of this question also clear after read all this presentation.
The three types of rectifiers in just 18 slides. Learn and enjoy the concepts. This PowerPoint presentation not only tells about the working and principles of rectifiers but also determines the disadvantages and advantages of different rectifiers. This PowerPoint presentation also has circuit diagrams that suit your necessities. This PPT can be written as an answer for a long type of question too.
Best 3 Applications Involving in Zener Diode Working Functionalityelprocus
Zener diodes are normal PN junction diodes operating in a reverse biased condition. Working of the Zener diode is similar to a PN junction diode in forward biased condition, but the uniqueness lies in the fact that it can also conduct when it is connected in reverse bias above its threshold / breakdown voltage. These are among the basic types of diodes used frequently, apart from the normal diodes.
Do Diodes and electronic stuff freaks you out?And what about those clippers and clampers?The details are as follows.
You can learn every concept related to it here.Enjoy clipping :)
A Zener diode is a type of diode that permits current not only in the forward direction like a normal diode, but also in the reverse direction if the voltage is larger than the breakdown voltage known as “Zener knee voltage” or “Zener voltage”.
The device is named after American physicist Clarence Melvin Zener, who first described the ZENER EFFECT in1934. Later his work led to the BELL LABS implantation of the effect in form of an electronic device, the ZENER DIODE.
Zener diodes are a modified form of PN silicon diode used extensively for voltage regulation. The P type and N type silicon used is doped more heavily than a standard PN diode.
This causes a very thin depletion region. The zener diodes breakdown characteristics are determined by the doping process
Zeners are commercially available with voltage breakdowns of 1.8 V to 200 V.
When a Zener diode is forward biased, it operates as a normal diode.
In forward biased P side connected to positive and N side connected to negative terminal of battery. In this case the electrons and holes are swept across the junction and large current flow through it.
In case of reverse biased current practically zero and at certain voltage which called Zener voltage the current increases sharply.
Each Zener diode has breakdown rating which specifies the max voltage that can be dropped across it.
Zener diodes are designed to operate in reverse breakdown. Two types of reverse breakdown in a zener diode are AVALANCHE and ZENER. The avalanche break down occurs in both rectifier and zener diodes at a sufficiently high reverse voltage. Zener breakdown occurs in a zener diode at low reverse voltages.
A Zener allows current to flow in the reverse direction when the voltage is above a certain value known as the breakdown voltage, "Zener knee voltage", "Zener voltage", “Avalanche point", or “Peak inverse voltage”
Breakdown Characteristics : Figure 2 shows the reverse portion of a zener diode’s characteristic curve. As the reverse voltage (푉_푅 ) is increased, the reverse current (퐼_푅 ) remains extremely small up to the “knee” of the curve. The reverse current is also called the zener current, 퐼_푍 . At this point, the breakdown effect begins; the internal zener resistance, also called zener impedance (푍_푍), begins to decrease as reverse current increases rapidly.Voltage Regulator :In a DC circuit, Zener diode can be used as a voltage regulator to regulate the voltage across small circuits.
Waveform Clipper :Zener diode can be used to make a Waveform Clipper. Two Zener diodes facing each other in series will act to clip both halves of an input signal.
Voltage Shifter :A Zener diode can be applied to a circuit with a resistor to act as a voltage shifter. This circuit lowers the output voltage by a quantity that is equal to the Zener diode's breakdown voltage.
In this configuration base is common for both input and output, input signal is applied between emitter and base terminals; and output is collected between collector and base terminals. Copy the link given below and paste it in new browser window to get more information on Common Emitter Configuration:- http://www.transtutors.com/homework-help/electrical-engineering/transistors/common-emitter-configuration.aspx
Description of zener diode.
Know about the equivalent circuits.
Know about zener diode and how it works as voltage stabilizer.
see its advantages and also its disadvantages
Thanks in advance.
Best 3 Applications Involving in Zener Diode Working Functionalityelprocus
Zener diodes are normal PN junction diodes operating in a reverse biased condition. Working of the Zener diode is similar to a PN junction diode in forward biased condition, but the uniqueness lies in the fact that it can also conduct when it is connected in reverse bias above its threshold / breakdown voltage. These are among the basic types of diodes used frequently, apart from the normal diodes.
Do Diodes and electronic stuff freaks you out?And what about those clippers and clampers?The details are as follows.
You can learn every concept related to it here.Enjoy clipping :)
A Zener diode is a type of diode that permits current not only in the forward direction like a normal diode, but also in the reverse direction if the voltage is larger than the breakdown voltage known as “Zener knee voltage” or “Zener voltage”.
The device is named after American physicist Clarence Melvin Zener, who first described the ZENER EFFECT in1934. Later his work led to the BELL LABS implantation of the effect in form of an electronic device, the ZENER DIODE.
Zener diodes are a modified form of PN silicon diode used extensively for voltage regulation. The P type and N type silicon used is doped more heavily than a standard PN diode.
This causes a very thin depletion region. The zener diodes breakdown characteristics are determined by the doping process
Zeners are commercially available with voltage breakdowns of 1.8 V to 200 V.
When a Zener diode is forward biased, it operates as a normal diode.
In forward biased P side connected to positive and N side connected to negative terminal of battery. In this case the electrons and holes are swept across the junction and large current flow through it.
In case of reverse biased current practically zero and at certain voltage which called Zener voltage the current increases sharply.
Each Zener diode has breakdown rating which specifies the max voltage that can be dropped across it.
Zener diodes are designed to operate in reverse breakdown. Two types of reverse breakdown in a zener diode are AVALANCHE and ZENER. The avalanche break down occurs in both rectifier and zener diodes at a sufficiently high reverse voltage. Zener breakdown occurs in a zener diode at low reverse voltages.
A Zener allows current to flow in the reverse direction when the voltage is above a certain value known as the breakdown voltage, "Zener knee voltage", "Zener voltage", “Avalanche point", or “Peak inverse voltage”
Breakdown Characteristics : Figure 2 shows the reverse portion of a zener diode’s characteristic curve. As the reverse voltage (푉_푅 ) is increased, the reverse current (퐼_푅 ) remains extremely small up to the “knee” of the curve. The reverse current is also called the zener current, 퐼_푍 . At this point, the breakdown effect begins; the internal zener resistance, also called zener impedance (푍_푍), begins to decrease as reverse current increases rapidly.Voltage Regulator :In a DC circuit, Zener diode can be used as a voltage regulator to regulate the voltage across small circuits.
Waveform Clipper :Zener diode can be used to make a Waveform Clipper. Two Zener diodes facing each other in series will act to clip both halves of an input signal.
Voltage Shifter :A Zener diode can be applied to a circuit with a resistor to act as a voltage shifter. This circuit lowers the output voltage by a quantity that is equal to the Zener diode's breakdown voltage.
In this configuration base is common for both input and output, input signal is applied between emitter and base terminals; and output is collected between collector and base terminals. Copy the link given below and paste it in new browser window to get more information on Common Emitter Configuration:- http://www.transtutors.com/homework-help/electrical-engineering/transistors/common-emitter-configuration.aspx
Description of zener diode.
Know about the equivalent circuits.
Know about zener diode and how it works as voltage stabilizer.
see its advantages and also its disadvantages
Thanks in advance.
This fun and visually appealing presentation about the core concept of diodes formation and application is thoroughly researched and concise. It contains fun tit-bits of info that make the concept of depletion layer easy to understand. It has a vibrant color scheme to make a perfect first impression for any project...
The Zener diode is fabricated in such a way that, its advantage is in its reverse bios. After a sufficient increase in reverse voltage across the junction, the minority carriers get sufficient kinetic energy due to the strong electric field. The high kinetic energy free electrons can collide strongly with the lattice ions so that they emit more free electrons, these liberated electrons also get high kinetic energy due to reverse applied electric field and they create more free electrons by collision cumulatively. This process may continue repeatedly and soon large free electron gas is created in the depletion layer, at which a small change in potential creates huge recombination and surge of carriers across the junction and hence large current through the circuit spontaneously and hence the entire diode will become conductive.
Zener diode is an important electronic device mainly used as voltage regulator. The experiment explains the determination of zener voltage and resistance of diode.
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3. Introduction
The zener diode is a silicon p-n junction devices that
differs from rectifier diodes because it is designed for
operation in the reverse-breakdown region.
4. Circuit of Zener
One Zener Diode connected with one resistence and
battery.
5. Characteristics
A Zener diode is always reverse connected
When forward biased, its characteristics are just like of
ordinary diode
It has sharp breakdown voltage, called Zener voltage
7. Principle of Zener Diode
The Working Principle of zener diode lies in the cause of
breakdown for a diode in reverse biased condition. Normally
there are two types of breakdown.
1) Zener Breakdown
2) Avalanche Breakdown.
8. Zener Breakdown
This type of breakdown occurs for a reverse bias voltage between 2 to
8V.
Even at low voltage, the electric field intensity is strong enough to exert
a force.
The valence electrons of the atom such that they are separated from the
nuclei.
This type of break down occurs normally for highly doped diode with
low breakdown voltage and larger electric field.
As temperature increases, the valence electrons gain more energy to
disrupt from the covalent bond and the less amount of external voltage
is required.
Thus zener breakdown voltage decreases with temperature.
9. Avalanche Breakdown
This type of breakdown occurs at the reverse bias voltage
above 8V and higher.
It occurs for lightly doped diode with large breakdown voltage.
As minority charge carriers (electrons) flow across the device.
They tend to collide with the electrons in the covalent bond and
cause the covalent bond to disrupt.
10. Avalanche Breakdown
As voltage increases, the kinetic energy (velocity) of the
electrons also increases.
The covalent bonds are more easily disrupted, causing an
increase in electron hole pairs.
The avalanche breakdown voltage increases with temperature.
12. As Voltage Regulator
In a DC circuit, Zener diode can be used as a voltage regulator
or to provide voltage reference.
The main use of zener diode lies in the fact that the voltage
across a Zener diode remains constant for a larger change in
current.
This makes it possible to use a Zener diode as a constant
voltage device or a voltage regulator.
In any power supply circuit, a regulator is used to provide a
constant output (load) voltage.
13. While designing a voltage regulator using zener diode
The latter is chosen with respect to its maximum power rating.
The maximum current through the device should be:-
Imax = Power/Zener Voltage
Since the input voltage and the required output voltage is
known.
It is easier to choose a zener diode with a voltage
approximately equal to the load voltage, i.e. Vz ~=Vo.
14. The value of the series resistor is chosen to be
R =(Vin – Vz)/(Izmin + IL), where IL = Load Voltage/Load
resistance.
It is advisable to use a forward biased diode in series with the
Zener diode.
This is because the Zener diode at higher voltage follows the
avalanche breakdown principle, having a positive temperature
of coefficient.
Hence a negative temperature coefficient diode is used for
compensation.